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A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)

Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 43

An illustration from A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart, 1875, leaf 43
lettered at itsends L in Enghsh instruments, and consists of two lines runningfrom the centre to the ends of the scale, and each di^dded into tenequal parts, each of which is again subdivided into 10, so that eaclileg of the scale contains 100 Fg- 24. equal parts. To illustrateits use, suppose that… … CHAP. Ill] Drawing the Map. 87 scale, and the angle of its opening must not be again changed.Now let a distance of 580 links be required. Open the div-ideratill the J reach from 58 to 58 on the two legs, as in the dotted linein the figure, and it is the required distance. Again, suppose thata scale…

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